属性动画是Google在3.0之后才提出的新动画框架,相比传统动画Animation只是系统不断调用onDraw方法重绘界面以实现动画效果。属性动画顾名思义是调用get、set方法真实改变属性。
传统Animation有很大的局限性:
1.只是重绘了动画,事件响应位置却没有改变,因此它不适用于具有交互动画的效果,只能做显示效果;
2.不断调用onDraw方法重绘很浪费资源;
3.位移,缩放,旋转,位移四种动画,组合可以实现丰富效果但仍不如属性。
因此,我们有必要好好学习属性动画。
看看Google的API Demos,有许多经典实用的小例子。(Google的心血)
是时候看一波代码了:
ObjectAnimator.ofFloat(image_iv_main,"translationX",0F,200F).setDuration(1000).start();
让对象image_iv_main在X轴从0平移到200,时间持续1000ms,go!
如果这样会发生什么?
ObjectAnimator.ofFloat(image_iv_main,"translationX",0F,200F).setDuration(1000).start();
ObjectAnimator.ofFloat(image_iv_main,"translationY",0F,200F).setDuration(1000).start();
ObjectAnimator.ofFloat(image_iv_main,"rotation",0F,360F).setDuration(1000).start();
对象会同时发生3个动画,X轴从0平移到200,Y轴从0平移到200,旋转360°,哈,你猜对了吗?
类似的效果还可以通过以下代码实现,有点代码复用的感觉。复用p1,p2,p3:
PropertyValuesHolder p1 = PropertyValuesHolder.ofFloat("rotation",0F,360F);
PropertyValuesHolder p2 = PropertyValuesHolder.ofFloat("translationY",0F,200F);
PropertyValuesHolder p3 = PropertyValuesHolder.ofFloat("translationX",0F,200F);
ObjectAnimator.ofPropertyValuesHolder(image_iv_main,p1,p2,p3).setDuration(2000).start();
进阶玩法,玩组合:
ObjectAnimator animator1 = ObjectAnimator.ofFloat(image_iv_main,"translationX",0F,200F);
ObjectAnimator animator2 = ObjectAnimator.ofFloat(image_iv_main,"translationY",0F,200F);
ObjectAnimator animator3 = ObjectAnimator.ofFloat(image_iv_main,"rotation",0F,360F);
AnimatorSet set = new AnimatorSet();
set.playTogether(animator1,animator2,animator3);
set.setDuration(2000);
set.start();
可以一起玩,还可以顺序玩:
set.playSequentially(animator1,animator2,animator3);
还可以调顺序:
set.play(animator1).with(animator2);
set.play(animator3).after(animator2);
更多玩法,等我们去探索~
最后送上完整源代码,high起来:
package com.example.quan.quanstudy.objectAnimator;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;
import com.example.quan.quanstudy.R;
import com.example.quan.quanstudy.base.BaseActivity;
/**
* Created by xingquan.he on 2017/3/15.
* Mr.Quan
* 属性动画第一课
* 项目实战:浅谈属性动画(1)-探索新玩法 http://blog.csdn.net/hxqneuq2012/article/details/52301791
*/
public class FirstClassActivity extends BaseActivity {
private ImageView mImageAnimator;
@Override
public int getLayoutId() {
return R.layout.activity_first_animator;
}
@Override
public void initView() {
mImageAnimator = (ImageView) findViewById(R.id.click_iv_animator);
}
public void click(View view){
Toast.makeText(this,"Clickd.",Toast.LENGTH_SHORT).show();
}
public void move(View view){
// ObjectAnimator.ofFloat(image_iv_main,"translationX",0F,200F).setDuration(1000).start();
// ObjectAnimator.ofFloat(image_iv_main,"translationY",0F,200F).setDuration(1000).start();
// ObjectAnimator.ofFloat(image_iv_main,"rotation",0F,360F).setDuration(1000).start();
// PropertyValuesHolder p1 = PropertyValuesHolder.ofFloat("rotation",0F,360F);
// PropertyValuesHolder p2 = PropertyValuesHolder.ofFloat("translationY",0F,200F);
// PropertyValuesHolder p3 = PropertyValuesHolder.ofFloat("translationX",0F,200F);
// ObjectAnimator.ofPropertyValuesHolder(image_iv_main,p1,p2,p3).setDuration(2000).start();
ObjectAnimator animator1 = ObjectAnimator.ofFloat(mImageAnimator,"translationX",0F,200F);
ObjectAnimator animator2 = ObjectAnimator.ofFloat(mImageAnimator,"translationY",0F,200F);
ObjectAnimator animator3 = ObjectAnimator.ofFloat(mImageAnimator,"rotation",0F,360F);
AnimatorSet set = new AnimatorSet();
//set.playTogether(animator1,animator2,animator3);
//set.playSequentially(animator1,animator2,animator3);
set.play(animator1).with(animator2);
set.play(animator3).after(animator2);
set.setDuration(1000);
set.start();
}
}
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity">
<ImageView
android:layout_width="100dp"
android:layout_height="56dp"
android:src="@mipmap/quan_shijiazhuang"
android:onClick="click"
android:id="@+id/click_iv_animator"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="move"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="50dp"
android:onClick="move"
android:id="@+id/move_btn_animator"
/>
</RelativeLayout>
原创不易,转载请注明出处哈。
权兴权意
产品可以更优雅~
项目实战:浅谈属性动画(1)-探索新玩法 - hxqneuq2012的专栏 - 博客频道 - CSDN.NET http://blog.csdn.net/hxqneuq2012/article/details/62216824
项目源代码,欢迎提建议(star)。
https://github.com/HXQWill/QuanStudy/tree/master/app/src/main/java/com/example/quan/quanstudy/objectAnimator